If Luke-Jr is still active, you may read
this thread and send a PM. It would work fine because the map is then hosted on a web server, and even the one which dedicated servers link to by default. I don't know if it's still maintained though, the last post in it is from November 2010. Maybe someone else has information on that.
I've also read somewhere that there is a built-in web server to aa-dedicated but I have no clue if that's even true or how to use it. From its half-done
wiki page I assume that it's not really working, I didn't read it all though. Also, that page is from 2005.
Or let your machine where the server runs on also run a web server. I can't really help on that though.
Maybe someone has an other easy solution available or knows a place where uploading and linking to it is possible. But I hope one of the suggestions above helps.